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Focus On Level Measurement
What is the difference between pulse radar level gauge and guided wave radar level gauge?
Because some materials that need to be measured cannot be directly contacted in industrial production, but there must be an accurate height or liquid level requirement. In this case, the general instrument is powerless, non-contact radar liquid level The meter is a kind of instrument that is particularly suitable for accurate measurement in this situation. There is also a radar level meter that can be measured by direct contact with the material to be measured by a waveguide wire or a probe. The two types mentioned above are What are the characteristics of these two types of radar level gauges and what are the application scopes of what we usually call pulse radar level gauges and guided wave radar level gauges? Through the following explanations in this article, you can have one More detailed understanding.
First of all, from the structural point of view, the fundamental difference between the pulse radar level gauge and the guided wave radar level gauge is that it is a non-contact type and a contact type. The type is selected according to the industrial and mining environment. The pulse is emitted through the beam angle of the horn mouth. And the ones that accept the microwave. Guided waves travel around and receive signals through rods or cables. The pulse radar level meter uses high-frequency or low-frequency wave pulses to transmit and receive through the antenna system. The radar wave runs at the speed of light, and the running time can be converted into a level signal by electronic components. The main reason is that the principle and structure are different. The guided wave radar level gauge is a measuring instrument based on the time travel principle. The radar wave runs at the speed of light, and the running time can be converted into a level signal by electronic components.
The second is to determine the type of selection according to the site conditions: what material solids and powders are measured on site. Pulse radar level meters are usually used (such as coal mines, slag, etc.). For dusty conditions, consider using guided wave radar level meters.
The third one can be considered according to the dielectric constant of the measured medium:
Guided wave radar level gauge is usually used for liquid, and it can be measured normally if the dielectric constant is greater than 0.7. The choice of flange for the guided wave radar level gauge is usually based on the size of the opening on the customer site, and it is normally equipped with a DN100 flange. Guided wave radar can be divided into rod type and cable, usually cable radar level gauge is used, which is more convenient for transportation. However, rod type radar level gauges should be used for those with corrosion resistance requirements, and pulse type radar level gauges can also be considered for liquids that are not very corrosive.
Temperature is also a factor that we must pay special attention to when selecting models. We can determine whether we need to add heat sinks according to the temperature provided on site. If the temperature is between -30 ℃ and 130 ℃, you can choose the ordinary type, which is greater than 130 ℃-250 ℃ I choose radar level meter with heat sink. In view of the current production technology and technology, for the measurement environment temperature of 250 degrees, the meter cannot reach a stable working state, so basically the measurement environment temperature is greater than 250 ℃ Don't do it.
Choose the flange thickness and related information according to the pressure parameters provided on site. No need to consider for normal pressure.
Whether explosion-proof is required according to the site environment and customer requirements, usually chemical liquids, coal mines, etc. require explosion-proof.
If you choose a pulse type radar level meter, because the radar is transmitted directly through the horn, it is the antenna of the pulse radar wave. Therefore, when we select the model, we try to choose a product with a larger size within the range allowed by the installation and production process. This can better ensure the stability of on-site measurement.
It is determined according to the on-site measurement range. It is worth noting that there are two types of pulse radar level meters: low-frequency pulse radar level meters and high-frequency pulse radar level meters.
The limit height that the low-frequency pulse radar level gauge can measure is 35 meters, and the limit height that the high-frequency pulse radar level gauge can measure is 70 meters.
Guided wave radar level gauges are also divided into two types, one is rod type radar level gauge and the other is cable type radar level gauge. The limit range of the rod type radar level gauge is 6 meters, and the limit range of the cable type radar level gauge is 30 meters. Taking these decisive parameters into consideration, the most suitable liquid level instrument can be selected.